Lightweight Webservices with Sinatra and RestClient

Lightweight web services with Sinatra and RestClient Adam Wiggins & Blake Mizerany Rubyconf 2008

What for?

app lifecycle

Birth: small and beautiful

Fate: sprawling mess

web services

Rails?

Rails? Too much.

Bare mongrel handler or Rack app?

Bare mongrel handler or Rack app? Too little.

Sinatra - the classy microframework for Ruby

require 'rubygems' require 'sinatra' get '/' do quot;Hello, whirledquot; end

$ ruby hello.rb

require 'rubygems' require 'sinatra' require 'lib/posts' post '/posts' post = Post.create! params redirect quot;/posts/#{post.id}quot; do get '/posts/:id' do @post = Post.find(params[:id]) erb :post end

‣Templating (erb, haml, builder) ‣Tests/specs (test/spec, rspec, test::unit) ‣Before filters ‣Helpers ‣Error handlers ‣Inline templates ‣Code reloading ‣HTTP caching (etag, last-modified) ‣Rack / inline middleware

A commitment to small

A commitment to small Rails 87,990 Merb-core 12,417 Ramaze 11,796 Camping 1,704 Sinatra 1,576

Sinatra is a proud Ruby citizen

examples

git-wiki http://github.com/sr/git-wiki 355 lines of Ruby

get '/:page' do @page = Page.find(params[:page]) haml :show end __END__ @@ layout %html %body %content=yield @@ show %h1= title #page_content= @page.to_html

rifgraf http://github.com/adamwiggins/rifgraf 61 lines of Ruby

github-services http://github.com/pjhyett/github-services 423 lines of Ruby

scanty http://github.com/adamwiggins/scanty 194 lines of Ruby

client side

ActiveResource?

ActiveResource? Too much.

Net::HTTP?

Net::HTTP? Too little.

RestClient - the Sinatra-inspired microclient for Ruby

require 'rubygems' require 'rest_client' RestClient.get 'http://localhost:4567/posts'

require 'rubygems' require 'rest_client' RestClient.post 'http://localhost:4567/posts', :author => 'Me', :title => 'First Post'

Console $ restclient http://example.com >> post '/resource', :value => 42 => quot;resultquot;

A better curl $ restclient get http://example.com/posts > posts.xml $ restclient post http://example.com/posts < post.xml $ restclient put http://example.com/posts/1 < post.xml $ restclient delete http://example.com/posts/1

Logging & replay $ RESTCLIENT_LOG=stdout ruby myscript.rb RestClient.get quot;http://example.com/postsquot; # => 200 OK | text/html 3781 bytes RestClient.post quot;http://example.com/postsquot;, quot;title=First+postquot; # => 200 OK | text/html 40 bytes

examples

heroku-client http://github.com/adamwiggins/heroku-client

couchrest http://github.com/jchris/couchrest

principles

“lagom”

“lagom” just the right amount

Fewer classes, less inheritance

Controller object mapping & routes vs. URLs

Controller object s ! RL mapping & routes U e r th fea vs. n ’t o URLs D

Exposed simplicity instead of hidden complexity

Small things, loosely joined, written fast - Justin Gehtland @ Relevance

http://github.com/bmizerany/sinatra http://rest-client.heroku.com/ http://adam.blog.heroku.com/ Adam Wiggins & Blake Mizerany Rubyconf 2008

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Lightweight Webservices with Sinatra and RestClient

by Adam Wiggins on Nov 07, 2008

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